WASHINGTON — China, the biggest buyer of U.S. Treasury securities, has increased its holdings for a fourth straight month.

The Treasury Department said Wednesday that China’s holdings of Treasury debt rose 2.6 percent in October to $906.8 billion. That’s the highest level in 11 months.

Overall, foreign holdings of Treasury securities rose 1.1 percent to $4.3 trillion. That indicates that other nations still have a strong appetite for Treasury debt even as the U.S. government continues to run $1 trillion-plus annual budget deficits.

Of the total foreign holdings, $2.85 trillion, or two-thirds, is held by foreign governments and central banks.

Japan, the second-largest holder of Treasury debt, expanded its portfolio to $877.4 billion, a 1.5 percent rise from October.

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